Java concurrency: is final field (initialized in constructor) thread-safe?

Question

Can anyone tell me whether this class is threadsafe or not ?

class Foo {

    private final Map aMap;

    public Foo() {
        aMap =         


        

Answer 1

This class has no concurrency issue cause you expose only a get method. If you add some method that modify the map you have to mark this method as synchronized.